Mechanical properties

Strength

The nominal yield strength shall be in the range of 235 N/mm2 to 690 N/mm2. The nominal tensile strength shall be in the range of 300 N/mm2 to 1000 N/mm2.

Ductility

The elongation after fracture on proportional gauge length shall be at least 15 %, for nominal yield strength not greater than 460 N/mm2; and shall be at least 10 % for nominal yield strength greater than 460 N/mm2.

The tensile strength to yield strength ratio shall be at least 1.2 based on nominal values, or at least 1.1 based on actual values, for nominal yield strength not greater than 460 N/mm2.

NOTE Conversion of elongation values measured not based on proportional gauge length is necessary and shall be performed according to BS EN ISO 2566-1.

Impact toughness

As a minimum, the product shall be able to absorb at least 27 J of impact energy at 20 °C.

NOTE Depending on other factors including the thickness and minimum service temperature, the impact toughness should also conform to the appropriate requirements as given in BS 5950-1.

Through thickness deformation properties

Where appropriate, through thickness deformation properties shall be specified to guarantee adequate

deformation capacity perpendicular to the surface to provide ductility and toughness against lamellar tearing.

NOTE Specification of through thickness deformation properties can be referred to BS EN 10164.

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Design Guide on Use of

Alternative

Steel

Materials

to BS 5950

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